Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Blue Sapphire (Ceylon)
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Mineral
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenstone / Quartzite Pebble
Metamorphosed Quartz-rich Rock
metamorphic
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Riverstone Quartzite
Quartzite (primarily SiO2)
metamorphic
River Cobble (likely Quartzite or Chert)
Quartzite (SiO2)
metamorphic
River Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
sedimentary (alluvial deposit)
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 primary composition)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Jasper (Agate-Jasper mixture)
Silicon Dioxide (SiO2) with impurities
sedimentary
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Limonite)
mineral
Quartz (Tumbled/Polished Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Fossil Sand Dollar (Echinoidea)
Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)
sedimentary
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Quartzite with Sandstone/Siltstone matrix
Metamorphosed Arenite (SiO2)
metamorphic
Granite Cobble
Felsic Intrusive Igneous Rock (Granite)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Orangey-white variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with Gneissic Banding
Quartzite (primarily SiO2) with mafic mineral inclusions
metamorphic
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Quartzite (River Stone)
Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)
metamorphic
Basalt (River Stone)
Aphanitic Mafic Igneous Rock
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Quartzite
Quartzite (high SiO2 content)
metamorphic
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic